/Engine/Plugins/Animation/ControlRig/Source/ControlRig/Public/Rigs/RigHierarchy.h
Sets a control's preferred euler angles (local transform rotation)
void SetControlPreferredEulerAngles ( [FRigControlElement](API\Plugins\ControlRig\Rigs\FRigControlElement) * InControlElement, const FVector & InEulerAngles, EEulerRotationOrder InRotationOrder, bool bInitial, bool bFixEulerFlips )